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          JavaScript编程
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        <p>HTML定义了网页的内容；CSS 描述了网页的布局；JavaScript确定了网页的行为。</p>
<p>一个完成的JS实现由下面三部分组成：1、核心ECMAScript；2、文档对象模型DOM；2、浏览器对象模型BOM。</p>
<p>1、ECMAScript与Web浏览器没有依赖关系，就是对实现该标准规定的各方面内容的语言的描述；</p>
<p>2、文档对象模型DOM：针对XML但经过扩展用于HTML的应用程序编程接口API；DOM把整个页面映射为一个多层节点结构，HTML页面中每个组成部分都是某种类型的节点，这些节点又包含着不同类型的数据；通过DOM创建的这个表示文档的树形图，开发者获得了控制页面内容和结构的主动权。借助DOM提供的API，开发人员可以自如地删除、添加、替换或修改任何节点。</p>
<p>3、浏览器对象模型BOM：开发人员使用BOM控制浏览器显示的界面以外的部分，</p>
<p>1、使用script元素嵌入JavaScript代码时，只须为script指定type属性，type=”text/javascript”，之后将JS代码直接放在元素内部，且包含在script内部的JS代码将从上至下被解释；即在解释器对script页面内的所有代码求值完以前，页面中其余内容都不会被浏览器加载或显示。</p>
<p>2、如果要通过script元素来包含外部JS文件，那么需要SRC属性，是一个指向外部JS文件的链接；</p>
<p>且带有src属性的script元素不应该在其script和/script标签之间再包含额外的JS代码，如果包含则只会下载并执行外部脚本文件而忽略内部嵌入的代码。</p>
<p>甚至SRC属性可以包含外部域的JS</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span> <span class="attr">src</span>=<span class="string">"example.js"</span> /&gt;</span></span><br><span class="line"><span class="handlebars"><span class="xml"><span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span> <span class="attr">src</span>=<span class="string">"http://www.somewhere.com/afile.js"</span>&gt;</span></span></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>现代WEB应用一般把全部JS引用放在body元素中页面内容的后面，以免加载时间过长；或者加上defer作为延迟脚本（延迟至html页面加载完毕），加上async作为异步脚本（不让页面等待两个脚本下载、执行，从而异步加载其他内容）。</p>
<p>一般还是尽可能得用外部文件来包含JS代码，可维护性、可缓存、适应未来。</p>
<h2 id="1、基本概念"><a href="#1、基本概念" class="headerlink" title="1、基本概念"></a>1、基本概念</h2><h4 id="变量"><a href="#变量" class="headerlink" title="变量"></a>变量</h4><p>松散类型变量，定义时用var后跟变量名，该变量可以用于保存任何值；但用var操作符定义的变量将成为定义该变量作用域中得局部变量，如果在函数中定义，则函数退出后便会销毁该变量。省略var操作符时可定义全局变量，但及其不推荐。</p>
<h4 id="数据类型"><a href="#数据类型" class="headerlink" title="数据类型"></a>数据类型</h4><p>5种简单得：Undefined（未定义）、Null（空）、Boolean（布尔型）、Number（数值）、String（字符串）；还有一种复杂的：Object（对象），数据类型具有动态性，无需再定义。用typeof操作符来返回给定变量的数据类型。</p>
<p>Undefined：只有一个值undefined，使用var声明变量时未对其初始化；</p>
<p>Null：只有一个值null，逻辑上表示一个空对象指针，因此使用typeof检测null值时会返回object，定义的变量要存储值则先初始化为null，可直接检查该值判断是否已经保存了一个对象的引用。事实上，undefined值派生自null值，因此它们的相等性测试返回true。</p>
<p>Boolean类型：只有两个字面值：true、false，且区分大小写，即True和False不是布尔类型，只是标识符，调用转型函数Boolean（）可以转换成对应的布尔值。</p>
<p>Number类型：表示整型和浮点数值，十进制、八进制（字面值第一位为0）、十六进制（字面值第一位为0X），ECMAScript会适时地自动将浮点型变为整型，对于极大、极小的数可用e来表示法表示的浮点数值表示。数值范围：Number.MIN_VALUE到Number.MAX_VALUE。</p>
<p>NaN：非数值，是一个特殊的数值，用于表示一个本来要返回数值的操作数未返回数值的情况。任何涉及NaN的操作都会返回NaN，因此用isNaN()函数，不能转换成数值的值都会导致该函数返回true，字符串”blue“不能转换成数值，因此返回true。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> floatNum = <span class="number">3.125e7</span></span><br><span class="line"><span class="comment">//e表示法表示的数值等于e前面的数乘以10的指数次幂</span></span><br></pre></td></tr></table></figure>

<p>Number():用于任何数据类型转换成数值；parseInt()：处理整数；parseFloat()：处理浮点数字字符。</p>
<p>String类型：单、双引号没有区别，包含一些转义序列；ECMAScript中字符串不可变，要改变一个字符串，首先要销毁原来的字符串，再用一个包含新值得字符串填充该变量。</p>
<p>toString()方法，返回对应值字符串；String()转型函数。</p>
<p>object类型：对象其实就是一组数据和功能的集合，对象可以通过执行new操作符后跟要创建的对象类型的名称来创建。Object的每个实例都具有下列方法、属性：</p>
<p>constructor:保存着用于创建当前对象的函数，构造函数；</p>
<p>hasOwnProperty(propertyName)：用于检查给定的属性在当前对象实例中是否存在，其中作为参数的属性名propertyName必须以字符串的形式指定；</p>
<p>isPrototypeOf(object)：用于检查传入的对象是否是当前对象的原型；</p>
<p>propertyIsEnumerable(propertyName)：用于检查给定的属性是否能够使用for-in语句来枚举，与hasOwnProperty(propertyName)方法一样，作为参数的属性名必须以字符串形式指定；</p>
<p>toLocaleString()：返回对象的字符串表示，该字符串与执行环境的地区对应；</p>
<p>toString()：返回对象的字符串表示；</p>
<p>valueOf()：返回对象的字符串、数值或布尔值表示。</p>
<h4 id="操作符"><a href="#操作符" class="headerlink" title="操作符"></a>操作符</h4><p>一元加操作符：对非数值应用时，该操作符会像Number转型函数一样对这个值执行转换；一元减操作符主要用于表示负数；</p>
<p>位操作符：用于最基本的层次上，即按内存中表示数值的位来操作数据，按位非~；按位与&amp;；按位或 | ;按位异或 ^；左移 &lt;&lt;;有符号的</p>

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